It flexes with spring-like resistance, has a magnetic ball for sliding, and a spinner for your thumb to roll around. Think Ink was fully funded on Kickstarter and can be bought for around £30.
Your thumb points to the north pole of the electromagnet. The magnetic field produced by the current in a coil of wire: is very similar to the field of a bar magnet; reverses when the direction of ...
Your thumb points to the north pole of the electromagnet. The magnetic field produced by the current in a coil of wire: is very similar to the field of a bar magnet; reverses when the direction of ...
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